When Lucian and Miranda are left alone in an isolated mansion for the weekend, their mutual attraction grows, as does their unease about the whereabouts of Miranda's ex-boyfriend who may be hiding somewhere in the house.

As the group settles into the secluded location, they discover that a UFO has crashed nearby and that they are being observed by one of the craft';s survivors. They end up attacking and killing the alien, which prompts a series of counterattacks by its crew mates.